Is the centrality dependence of the elliptic flow v{sub 2} and of the average <p{sub T}> more than a core-corona effect?

Journal Article · Wed Sep 15 00:00:00 EDT 2010 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.82.034906· OSTI ID:21419546

Aichelin, J; Werner, K ^[1]

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1. SUBATECH, Laboratoire de Physique Subatomique et des Technologies Associees, Universite de Nantes-IN2P3/CNRS-Ecole des Mines de Nantes 4 rue Alfred Kastler, F-44072 Nantes, Cedex 03 (France)

Recently we showed that the centrality dependence of the multiplicity of different hadron species observed in Relativistic Heavy Ion Collider (RHIC) and Super Proton Synchrotron (SPS) experiments can be well understood in a simple model, dubbed the core-corona model. There it is assumed that those incoming nucleons that scatter only once produce hadrons as in pp collisions whereas those that scatter more often form an equilibrated source which decays according to phase space. In this article we show that also kinematical variables such as v{sub 2}/{epsilon}{sub part}(N{sub part}) as well as v{sub 2}{sup i}/{epsilon}{sub part}(N{sub part}) and <p{sub T}{sup i}(N{sub part})> of identified particles are well described in this model. The correlation of <p{sub T}{sup i}> between peripheral heavy-ion collisions and pp collisions for different hadrons, reproduced in this model, questions whether hydrodynamical calculations are the proper tool to describe a noncentral heavy-ion collision. The model explains as well the centrality dependence of v{sub 2}/{epsilon}{sub part} of charged particles, considered up to now as an observable that allows us to determine the viscosity of the quark-gluon plasma. The observed dependence of v{sub 2}{sup i}/{epsilon}{sub part}(N{sub part}) on the particle species is a simple consequence of the different ratios of core-to-corona particles.

• OSTI ID: 21419546
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 82, Issue 3; Other Information: DOI: 10.1103/PhysRevC.82.034906; (c) 2010 The American Physical Society; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BROOKHAVEN RHIC
CERN SPS SYNCHROTRON
CHARGED PARTICLES
CORRELATIONS
DECAY
HEAVY ION REACTIONS
MULTIPLICITY
PHASE SPACE
PROTON-PROTON INTERACTIONS
PROTONS
QUARK MATTER
SYNCHROTRONS
VISCOSITY
ACCELERATORS
BARYON-BARYON INTERACTIONS
BARYONS
CYCLIC ACCELERATORS
ELEMENTARY PARTICLES
FERMIONS
HADRON-HADRON INTERACTIONS
HADRONS
HEAVY ION ACCELERATORS
INTERACTIONS
MATHEMATICAL SPACE
MATTER
NUCLEAR REACTIONS
NUCLEON-NUCLEON INTERACTIONS
NUCLEONS
PARTICLE INTERACTIONS
PROTON-NUCLEON INTERACTIONS
SPACE
STORAGE RINGS